I don\'t know about foolproof but I think you always have to paint slowly and carefully to get the best results with yellows.
Working over an ochre basecoat often helps because they tend to be more opaque than any true yellow so they provide a good base. I would also find a good yellow or two - if you were using artists\' paints I\'d suggest cadmium yellows - and stick to them for normal painting methods, no point in giving ourselves an uphill battle by using something which just doesn\'t cover well enough (although a paint like this can be useful for glazing, see below).
Because yellows are generally so transparent another thing you might try is painting the entire area ochre and shading/highlighting it accordingly; then lightly glaze yellow over this completed shade job (a little on the midtone areas but mostly on the highlights, skip the shadows) to provide the finished look.
If you\'re working over a black basecoat your procedure will have to be a bit different.
Einion